Boat propeller



FIG. 1 is a top perspective view of the boat propeller;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a left/right view thereof;

FIG. 6 is a front/back view thereof; and,

FIG. 7 is another bottom perspective thereof.

The broken lines shown illustrate portions of the boat propeller that form no part of the claimed design. 

CLAIM The ornamental design for a boat propeller, as shown. 